Usage:
Mammoth Mountain Member of Carpenter Ridge Tuff (CO*-recognized locally in Creede district)
Geologic age:
early Tertiary (late Oligocene; Chattian)*
Type section, locality, area and/or origin of name:
Named from Mammoth Mountain, [northeast of North Creede, in NW/4 sec. 20, T. 42 N., R. 1 E., Lat. 37 deg. 52 min. 46 sec. N., Long. 106 deg. 54 min. 09 sec. W., San Luis Peak 7.5-min quadrangle, Mineral Co.], Creede district, southwestern CO (Emmons and Larsen, 1923).
AAPG geologic province:
San Juan Mountains province*
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).